Improving Ambiguity Convergence in Carrier Phase-Based Precise Point Positioning
Improving Ambiguity Convergence in Carrier Phase-Based Precise Point Positioning
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DOI：
10.5072/prism/23420
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发表时间：
2001-09
期刊：
影响因子：
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通讯作者：
Xiaobing Shen;Yane Lu;Lei Dong;Xiaohong Zhang;Changlin Ma;Junjie Liu;Kongzhe Chen;Zhizhao Liu-
中科院分区：
文献类型：
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作者：
Xiaobing Shen;Yane Lu;Lei Dong;Xiaohong Zhang;Changlin Ma;Junjie Liu;Kongzhe Chen;Zhizhao Liu-
本文介绍了一种新的GPS处理方法--精密单点定位（PPP）的改进研究成果。目前，PPP是用所谓的传统模型实现的，该模型基于非差分双频码和载波相位观测值，辅以精确的卫星轨道和时钟产品。分米到厘米的精度是可以达到的，而平均需要半小时的收敛时间。为了将PPP系统用于实时定位和导航应用，加速模糊度收敛因此对于快速定位收敛解决方案是必不可少的。在此基础上，提出了一种新的PPP处理方法-- P1-P2-CP模型，该模型具有较低的测量噪声和较小的剩余误差。而P1-P2-CP模型的最大优点是可以进行固定模糊度解算，从而减少了未知量，加快了解的收敛速度。在模型的实现过程中，方差调整过程被应用于获得更精确的观测值和参数的随机信息，并初步开发了基于伪固定概念的部分模糊度搜索和固定方法。本文包括静力学和运动学处理中浮点解的数值结果和分析。在静态处理模式下的固定的解决方案的结果。进一步考虑的收敛性能的改善也得到了解决。四、致谢
This thesis describes the research results in the improvement of a new GPS processing approach: precise point positioning (PPP). Currently, PPP is implemented with the so-called Traditional Model based on the un-differenced dual frequency code and carrier phase observations aided by the precise satellite orbit and clock products. Decimetre to centimetre accuracy is achievable while an average of half an hour of convergence time is required. In order for the PPP system to be used in real-time positioning and navigation applications, accelerating ambiguity convergence therefore is essential for a fast positioning convergence solution. With the newly developed code-phase ionosphere-free combination in this research, an alternative PPP processing method – P1-P2-CP Model – was proposed, which has a lower measurement noise and a smaller residual error. But the biggest gain of the P1-P2-CP Model is the feasibility of the fixed ambiguity resolution which brings fewer unknowns, therefore accelerating solution convergence. In the model's implementation, a variance adjustment procedure was applied to obtain more precise stochastic information of both observations and parameters, and a partial ambiguity searching and fixing approach based on a pseudo-fixing concept was preliminarily developed. Included in this thesis are the numerical results and analyses of float solutions in both static and kinematics processing. Fixed solution results in static processing mode are also presented. Further considerations for the improvements of the convergence performance are also addressed. iv ACKNOWLEDGEMENTS